In generalizing from a sample in order to achieve an error margin

Question

In generalizing from a sample, in order to achieve an error margin of plus or minus 3 percentage points at a confidence level of about 95 percent, whats the smallest random sample we can get away with, regardless of the size of the population?

A. 10 percent of the population

B. 100

C. 500

D. 1,000

E. 5,000

Answer

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